boot.initrd.clevis.devices.<name> relies on fileSystems.<name>.device which not used by a system deployed with disko

[elias-online]

When using disko to deploy systems, fileSystems.<name> = { }. is not used which prevents setting boot.initrd.clevis.devices.<name> = { } and therefore the use of Clevis entirely.

Clevis enables root filesystem decryption on a remote host. Example NixOS implementation here:
https://camillemondon.com/talks/fosdem24-clevis/#/the-nixos-implementation

Is this something that can be worked around somehow or would the boot.initrd.clevis need to have another way of defining devices?

[elias-online]

To clarify a little on the reproduction steps on this:

1. Deploy a system with disko
2. Add the following to your configuration:

boot.initrd.clevis.enable = true;
boot.initrd.clevis.devices."/dev/sdX".secretFile = "/secret.jwe";

3. Running nixos-rebuildresults in:

error:
       Failed assertions:
       - No filesystem or LUKS device with the name /dev/sdX is declared in your configuration.

[Enzime]

Do you have mountpoint set? Whether or not fileSystems gets set is based on whether or not mountpoint is set:

disko/lib/types/filesystem.nix

Lines 80 to 86 in 3a4de9f

	default = lib.optional (config.mountpoint != null) {
	fileSystems.${config.mountpoint} = {
	device = config.device;
	fsType = config.format;
	options = config.mountOptions;
	};
	};